<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        // 对象打印是地址，当你把三角形展开的一瞬间，找地址对应的值
        var obj = { name: 'zs', age: 20 }
        console.log(obj);
        obj.age = 30 
    </script>
</body>

</html>